EP0039377B1 - Warmformen rohrförmiger Gegenstände - Google Patents

Warmformen rohrförmiger Gegenstände Download PDF

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Publication number
EP0039377B1
EP0039377B1 EP19800301489 EP80301489A EP0039377B1 EP 0039377 B1 EP0039377 B1 EP 0039377B1 EP 19800301489 EP19800301489 EP 19800301489 EP 80301489 A EP80301489 A EP 80301489A EP 0039377 B1 EP0039377 B1 EP 0039377B1
Authority
EP
European Patent Office
Prior art keywords
articles
fluid
temperature
cooling
oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19800301489
Other languages
English (en)
French (fr)
Other versions
EP0039377A1 (de
Inventor
Peter Robert Mitchell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE8080301489T priority Critical patent/DE3068662D1/de
Priority to EP19800301489 priority patent/EP0039377B1/de
Publication of EP0039377A1 publication Critical patent/EP0039377A1/de
Application granted granted Critical
Publication of EP0039377B1 publication Critical patent/EP0039377B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/12—Bending or folding helically, e.g. for making springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/004—Bent tubes

Definitions

  • the invention relates to thermoforming articles and is more particularly concerned with methods of manufacturing articles having a predetermined shape or form and manufactured from heat mouldable tubular material.
  • thermoplastic tubular material can be bent with a bending die at suitable temperatures followed by cooling to set the material in the bent configuration.
  • a process is described in German specification No. DE-A-2 355 468 wherein a pipe of plastics material is heated by radiant heat, bent to the required shape and cooled by passing cooling water therethrough. No heating is effected subsequent to the bending or forming step.
  • Such a process suffers the disadvantage that the finished articles are lacking in thermal stability, i.e. when the service conditions result in the article being reheated to temperatures approaching the temperature at which they were initially bent there is a tendency for articles to resume the original shape or form of the tubular material.
  • thermally stable predetermined shaped articles from tubular material that can be thermoformed.
  • the first of these methods comprises injection moulding in which the article is formed in an openable mould.
  • the mould comprises a casing and a core, the mould being designed so that the core can be removed from the moulded articles.
  • the mould is heated.
  • the article is shaped from material while the material is in a plastic or pliable state and then the shaped article is baked or at least heated in an autoclave or oven.
  • French specification No. FR-A-2342 144 articles having a predetermined shape or form are heated and cooled whilst in the predetermined form by sequential immersion in hot and cold water or by heating in an oven or by warm air and optionally cooling in ambient air.
  • a method of annealing tubular articles of heat mouldable material comprising forming and restraining the articles in the predetermined shape or form, heating the articles to the annealing temperature for a time to effect the annealing thereof and cooling the articles to set while restrained in the predetermined shape or form (FR-A-2 342 144), characterised in that the articles are preheated to a temperature below the annealing temperature before being formed and restrained in the predetermined shape or form, the preheating and the heating to annealing temperature and the cooling of the articles being effected by passing heating and cooling fluids therethrough as appropriate, the heating fluids being the same fluid as the cooling fluid.
  • the heating fluid employed is the same substance as the fluid used for cooling the effects of any intermixing of the heating and cooling fluid is minimised.
  • the preheating step allows the tubular articles to be readily bent to the predetermined shape or form to be fitted to a jig structure defining the predetermined shape or form.
  • the fluid is oil which has a boiling point higher than the desired processing temperature.
  • Suitable heat mouldable or thermoformable materials are polyethylene, vinyl polymers such as polyvinyl chloride, polyvinyl acetate or polyamides.
  • the invention is particularly suitable for use with high pressure nylon hose heated to the annealing temperature by a heating fluid at a temperature of between 150°C and 170°C.
  • the hose can be preheated prior to bending by passing fluid therethrough at a temperature of 100°C for a period of two minutes.
  • the tubular article can be shaped either by winding it onto a former to form a coil or by threading it onto or fixing it to a jig or like support structure.
  • the initial tube is straight and flexible and is wound into a coil 11 on a rigid, in this example wooden, cylindrical former 12.
  • the tube is formed on nylon hose, having an internal diameter of about 1 cm and a wall thickness of about 0.1 cms.
  • the former is about 12 to 15 cms. in diameter and about 60-75 cms long.
  • the former is detachably and rotatably mounted in a suitable frame (not shown).
  • the tube is wound as a coil onto the former either while the former is detached from its mounting frame or by rotating the former in its frame and feeding the tube onto the rotating former.
  • the former may be helically grooved to receive the tube.
  • the rigidity of the wall of the tube is such that the bore remains substantially constant and the tube does not flatten.
  • the coil When the coil has been wound on the former it is connected by a feed conduit 13 to a liquid pump 14 connected via a three-way valve V1 to a hot oil reservoir 16.
  • the oil in the reservoir is Shell Clavus 25.
  • An immersion heater is used in this example to heat the oil to a temperature of 150°C.
  • Oil is returned to the reservoir 16 by a return conduit 17 including a second three-way valve V2.
  • a second inlet of the supply valve V1 is connected to the outlet of a cold oil reservoir 21 and a second outlet of the return valve V2 is connected to the inlet of the reservoir 21.
  • the cold oil is at room temperature but can be cooled to a lower temperature.
  • the pump After winding the coil and connecting up the conduits, the pump is switched on and hot oil flowed through the coil. The flow is maintained for about four minutes with the reservoir oil temperature at about 150°C.
  • the valves V1 and V2 are then adjusted to change the oil flow from hot oil to cold oil. The cold oil is allowed to flow for about four minutes.
  • the oil is then vented from the coil by setting the valve 14 to its third setting in which air is pumped into the coil. Finally, and if required, the oil in the coil can be scavenged, for example by admitting a blast of nitrogen from a high pressure source into the coil.
  • the former After cooling, and scavenging if desired, the former is removed from its mounting frame and taken out from the coil.
  • the coil retains its helical form.
  • the helical coil can be extended and compressed in the manner of a concertina. Suitable fittings can be swaged or otherwise secured to the ends of the coil tube to permit it to be connected in a fluid or vacuum circuit.
  • the coil is thermally stable.
  • the article is of relatively large size.
  • the article is usable, for example, in the air conditioning system of a vehicle and replaces a similar product which has hitherto often been assembled from discrete parts, at least some of which were metal.
  • the article is formed from what is commercially identified as "high pressure nylon hose".
  • Such hose is flexible in that it can be wound into relatively large diameter coils of, say for a 1.25 cm bore hose, 75-100 cms diameter.
  • the hose cannot be taken around small radius curves e.g. curves of say 5 to 10 cms radius.
  • the article comprises five consecutive sections 31 to 35 and is between 1 t and 2 meters in length.
  • the sections are not all in the same plane and, in fact, in this example only sections 31, 32 are in the same plane.
  • the article is formed using a jig structure which provides a grooved path into which the hose can be fitted. This is done by first laying out the hose alongside the jig path and then flowing oil at a temperature of 100°C through the hose for two minutes. By this time the hose has reached a temperature at which the nylon wall is sufficiently flexible to permit the tube to be fitted into and secured in the jig path. The oil temperature is then raised to between 150°C and 170°C and caused to flow for a further four minutes.
  • the hose is connected in an oil flow circuit similar to that illustrated in Figure 1. Thereafter, the oil flow is changed from hot oil to cold (room temperature) oil to cool the hose to set and then vented and, if required, scavenged.
  • a fluid other than oil e.g. a gas or water
  • the article can be moulded to have substantially any reasonable, required shape or form.
  • the two described articles retain the full bore through their length since collapse of the tube is prevented by the internal liquid pressure.
  • it is required to introduce a constriction this can be done when the tube is heated after bending.
  • an exterior fixing flat is required this can be moulded into the tube wall.
  • the ambient medium was atmospheric air.
  • a different medium for example a liquid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (3)

1. Verfahren zum Tempern rohrförmiger Gegenstände aus warm formbarem Material, wobei die Gegenstände in der vorherbestimmten Gestalt oder Form geformt und festgehalten werden, die Gegenstände (11) auf die Tempertemperatur für eine Zeite erhitzt werden, um ihre Temperung zu bewirken, und die Gegenstände zum Aushärten, während sie in der vorherbestimmten Gestalt oder Form festgehalten werden, gekühlt werden, dadurch gekennzeichnet, daß die Gegenstände (11) auf eine Temperatur unterhalb der Tempertemperatur vorerhitzt werden, bevor sie in der vorherbestimmten Gestalt oder Form geformt und festgehalten werden, wobei das Vorerhitzen und das Erhitzen auf die Tempertemperatur und das Abkühlen der Gegenstände durch entsprechendes Hindurchführend von Heiz- und Kühlfluiden (16, 21) durch sie bewerkstelligt wird, wobei die Heizfluide (16) dasselbe Fluid wie das Kühlfluid (21) sind.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Fluid (16, 21) öl ist.
3. Verfahren nach Anspruch 1, bei dem das Rohr ein Hochdruckschlauch ist, der durch Fluid mit einer Temperatur zwischen 150°C und 170°C auf die Tempertemperatur erhitzt wird, dadurch gekennzeichnet, daß das Vorerhitzen vor dem Biegen durch Fluid bei 100°C für eine Dauer von zwei Minuten bewirkt wird.
EP19800301489 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände Expired EP0039377B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8080301489T DE3068662D1 (en) 1980-05-07 1980-05-07 Thermoforming tubular articles
EP19800301489 EP0039377B1 (de) 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19800301489 EP0039377B1 (de) 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände

Publications (2)

Publication Number Publication Date
EP0039377A1 EP0039377A1 (de) 1981-11-11
EP0039377B1 true EP0039377B1 (de) 1984-07-25

Family

ID=8187159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800301489 Expired EP0039377B1 (de) 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände

Country Status (2)

Country Link
EP (1) EP0039377B1 (de)
DE (1) DE3068662D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667454A (en) * 1982-01-05 1987-05-26 American Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
US4643857A (en) * 1982-06-14 1987-02-17 Cousin Jean Claude Racket frame
US4642968A (en) * 1983-01-05 1987-02-17 American Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
US4880129A (en) * 1983-01-05 1989-11-14 American National Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
US6287508B1 (en) * 1999-02-26 2001-09-11 Dayco Products, Inc. Method for manufacturing curved thermoplastic tubes
JP2001009902A (ja) 1999-04-30 2001-01-16 Piolax Inc 屈曲樹脂ホースの製造法
EP3593975A1 (de) * 2018-07-09 2020-01-15 MSV SYSTEMS CZ s.r.o. Verfahren zur formung von produkten aus hdpe oder pa, insbesondere zum räumlichen formen von hdpe- oder pa-rohren, und vorrichtung zur durchführung davon

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB902745A (en) * 1958-01-08 1962-08-09 Hilmor Ltd Improvements in or relating to the bending of thermoplastic tubes
GB1126421A (en) * 1964-09-26 1968-09-05 Rubber And Plastics Res Ass Of Method of forming hollow articles
DE1268361B (de) * 1965-07-27 1968-05-16 E H Karl Friedrich Naegele Dr Vorrichtung zum thermischen Fixieren von fortlaufend gewickelten Schraubenfedern auseinem Kunststoffstrang
US3376606A (en) * 1966-06-03 1968-04-09 Aqua Tec Corp Apparatus for forming and bending thermoplastic tubes, rods, and the like
GB1276086A (en) * 1968-06-10 1972-06-01 Secr Defence Methods for treating tubes of thermoplastic materials such as glass or silica
US3890079A (en) * 1972-11-13 1975-06-17 Universal Plastic Pipe Bending Automatic machine for bending and flaring quantities of plastic pipe
CH597997A5 (de) * 1976-02-24 1978-04-28 Lpa Les Produits Associes
AU508942B2 (en) * 1977-12-02 1980-04-17 Yoshino Kogyosho Co., Ltd. Preparing saturated polyester resin bottles

Also Published As

Publication number Publication date
EP0039377A1 (de) 1981-11-11
DE3068662D1 (en) 1984-08-30

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